Access Control Updates for LangSmith

LangSmith has introduced new access control features to help large engineering teams manage permissions for LLM applications. The update includes Role Based Access Control (RBAC), allowing administrators to assign built-in roles like Admin, Viewer, and Editor, or create custom roles with specific permissions. This system helps ensure users only have the access necessary for their jobs. Additionally, API keys have been updated to include Personal Access Tokens, which mirror the user's permissions, and Service Keys, which act as privileged service principals for services talking to the LangSmith API.